KR20130073127A - Frp tube for composite bushing having different inside and outside diameter of both ends and composite bushing manufactured using the same - Google Patents

Abstract

PURPOSE: A composite bushing FRP tube which has different inside and outside diameters of both end parts and a composite bushing which is manufactured by using the same are provided to implement a weight reduction by controlling a length of product according to an electric power. CONSTITUTION: An upper tube (21) has predetermined inside and outside diameters. The tube is formed in a cylindrical shape. A lower tube (23) has inside and outside diameters which are bigger than the inside and outside diameters of the upper tube. A middle tube (22) connects the upper tube and the lower tube with each other. The middle tube is formed in a conical shape.

Description

FRP tube for composite bushing manufactured using the same, and the composite bushing manufactured using the same.

TECHNICAL FIELD The present invention relates to a composite bushing, and more particularly, to a composite bushing FRP tube having different inner and outer diameters at both ends, and a composite bushing manufactured using the same.

In general, the bushing is an insulator used to insulate the inlet of a power device such as a transformer, a circuit breaker, or a GIS, and is mostly used outdoors. A conventional porcelain bushing is damaged by pollutants in the atmosphere such as ultraviolet rays and rain. Not only occurs, the impact strength is weak, explosion-proof performance is a problem.

In order to solve this problem, a bushing is recently manufactured using a hollow composite insulator type, that is, a composite bushing.

Unlike conventional magnetic bushings, such composite bushings do not scatter fragments due to brittle fracture, and are easy to handle, lightweight, and shockproof as well as explosion-proof.

Composite bushing has FRP tube, a fiber-reinforced composite material composed of thermosetting resin such as glass fiber and epoxy resin, and flanges made of metal are combined at both ends of FRP. It consists of a housing in which several sheds are vacuum injected using a material such as silicone rubber.

In particular, the housing improves electrical insulation performance and mitigates external shocks, accounting for about 50% of the total weight, and the electrical performance is influenced by the shaded surface leakage distance, or Creepage Distance length.

The bushing length is increased to secure the creepage distance, but the portion where the actual electric field is concentrated is the lower part.

Where the actual electric field is concentrated, it is necessary to design the outer diameter of the bushing larger than the other parts, but there is no reason to make the portion where the electric field is relaxed (the upper side of the bushing) equal to the lower outer diameter of the bushing.

The shape of the composite bushing is divided into a straight type and a conical type.

The straight type composite bushing has a problem that the inner and outer diameters are the same to the upper part where the electric field is hardly applied, thereby increasing the weight and filling the internal insulation.

To solve this problem, conical hollow composite insulators have been developed and used, but this has the effect of reducing weight and reducing the amount of filling insulation, but it is impossible to control the overall length of the product, so that composite bushings of different sizes can be used. When manufacturing, it is inevitable to manufacture a separate mold.

SUMMARY OF THE INVENTION An object of the present invention for solving the above-described problems is to provide a composite bushing that can adjust the length of a product that requires different size characteristics for each power and can be injection molded through a common mold.

In addition, the object of the present invention is to reduce the production cost of the product by reducing the amount of filling insulation to be lighter and lighter by changing the inner and outer diameters in consideration of concentration and relaxation of the electric field.

The composite bushing FRP tube having different inner and outer diameters at both ends according to the present invention for solving the above problems is a cylindrical upper tube having a predetermined inner and outer diameter, and a lower tube having an inner and outer diameter larger than the inner and outer diameters of the upper tube. And a tapered conical intermediate tube connecting the upper tube and the lower tube to each other.

Here, the upper tube, the lower tube and the intermediate tube may be manufactured integrally.

Here, the upper tube, the lower tube, and the intermediate tube may be separated and manufactured by winding respective molds and assembled with each other by an adhesive.

In this case, both ends of the intermediate tube are formed with a first connection part and a second connection part having a step, and are implemented to be assembled with the upper tube and the lower tube by the first and second connection parts.

Here, the intermediate tube may be assembled to the inner side or the outer side of the upper tube and the lower tube by the first connecting portion and the second connecting portion.

Here, when the intermediate tube is assembled to the inner surfaces of the upper tube and the lower tube by the step of the first connection portion and the second connection portion, the outer diameter is the same, and the intermediate tube is the outer side of the upper tube and the lower tube. When assembled to the side it is preferable to implement so that the inner diameter is the same.

In addition, a composite bushing having different inner and outer diameters at both ends according to the present invention includes a cylindrical upper tube having a predetermined inner and outer diameter, a lower tube having an inner and outer diameter larger than the inner and outer diameters of the upper tube, and the upper tube and the lower tube. An FRP tube including a tapered conical intermediate tube connected to each other, an upper bracket and a lower bracket assembled to upper and lower ends of the FRP tube, and a plurality of shades on the outside while the FRP tubing and the upper and lower brackets are assembled. It may be made including a housing that is injection-molded to form.

Here, the upper tube, the lower tube and the intermediate tube of the FRP tube may be manufactured in one piece, or may be manufactured by winding each mold in a separate form and assembled with each other by an adhesive.

According to the configuration of the present invention described above, it is possible to adjust the product length required for the characteristics of different sizes for each power, injection molding is possible through a common mold, it is possible to reduce the weight and production cost of the product.

1 is a structural cross-sectional view of a composite bushing according to the present invention.
2 is a first structural diagram of a composite bushing FRP tube having different inner and outer diameters at both ends according to the present invention.
3 is a second structural diagram of a composite bushing FRP tube having different inner and outer diameters at both ends according to the present invention.
4 is a third structural diagram of a composite bushing FRP tube having different inner and outer diameters at both ends according to the present invention.
5 is a fourth structural diagram of a composite bushing FRP tube having different inner and outer diameters at both ends according to the present invention.
6 is a fifth structural diagram of a composite bushing FRP tube having different inner and outer diameters at both ends according to the present invention.
7 is a cross-sectional view of a coupling structure of a composite bushing (first structure) and an injection mold according to the present invention.
8 is a view showing an example of manufacturing a composite bushing by the same injection mold through the detachment of the unit injection mold according to the change in the length of the composite bushing (first structure) according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described the structure and effect of the composite bushing FRP and the composite bushing manufactured using the same in the inner and outer diameters of both ends according to the present invention.

1 is a structural cross-sectional view of a composite bushing according to the present invention.

As shown in FIG. 1, the composite bushing according to the present invention is largely composed of an FRP tube 11, an upper bracket 12, a lower bracket 13, and a housing 14.

The composite bushing according to the present invention heats and expands the upper and lower brackets 12 and 13 made of a metal such as aluminum alloy, and then moves the FRP tube 11 coated with the adhesive to the upper and lower brackets 12 and 13. It is pressed into the insertion hole, and is manufactured by vacuum injection molding several shades (Shed) on the pressed FRP tube (11).

The outer diameter of the upper end of the FRP tube 11 is formed to be almost the same or slightly larger than the inner diameter of the insertion hole of the upper bracket 12, and the outer diameter of the lower end is formed to be almost the same or slightly larger than the inner diameter of the lower opening 13 to be inserted into the FRP tube. (11) and the upper and lower brackets (12, 13) to be crimped.

The composite bushing is then fabricated by vacuum injection molding after bonding for hermetic performance and sealing.

The FRP tube 11 is manufactured by a general filament winding method, and after release treatment on a mandrel, the glass fiber impregnated with a resin is wound at a predetermined angle or various angles, and then demolded by a demolding machine after the curing process. It is produced by the process.

A glass impregnating tape may be formed on the inner circumferential surface of the FRP tube 11 to prevent the penetration of moisture into the inside, and a heat resistant adhesive may be applied to the joint portion of the FRP tube 11 and the upper and lower brackets 12 and 13. In addition, it is possible to form an adhesive groove and to give a roughness can improve the adhesive strength, of course.

Unlike the conventional straight type or conical type, the composite bushing of the present invention has a relatively large outer diameter at the lower portion where the electric field is concentrated, and an outer diameter at the upper portion where the electric field is relatively relaxed. It is formed small, the upper and lower portions having different outer diameters are connected to each other or integrally formed by the inclined middle portion.

Composite bushings having such a diameter are made possible by the structure of the FRP tube described in the following FIGS. 2 to 6.

2 to 6 are first to fifth structural views of the FRP tube for composite bushings having different inner and outer diameters at both ends according to the present invention.

The structure of the FRP tube 20 of Figure 2 is integrally produced without winding by making a mold without a connection.

The first structure of the FRP tube 20 shown in FIG. 2 has a structure in which the upper tube 21, the intermediate tube 22, and the lower tube 23 are integrally formed without a connection, and the upper tube 21 has an upper portion. The bracket 12 is inserted and pressed, and the lower tube 23 is the lower bracket 13 is inserted and pressed.

The lower tube 23 is a portion in which an electric field is concentrated, and an outer diameter thereof is larger than that of the upper tube 21 in which the electric field is relatively relaxed.

The intermediate tube 22 has a tapered shape that connects the upper tube 21 and the lower tube 23.

Unlike the first structure, the structure of the FRP tube of FIGS. 3 to 6 is formed as a detachable structure rather than an integrated structure.

Each of the second to fifth structures of the FRP tubes 30 to 60 shown in FIGS. 3 to 6 commonly have an upper tube 31 to 61, an intermediate tube 32 to 62 and a lower tube 33 to 63. It can be made by bonding to ensure the airtightness and strength using an adhesive, and to manufacture each mold to be wound and manufactured, the inner and outer diameters of the upper tube (31 to 61) than the lower tube (33 to 63) It is formed small and the intermediate tube (32 to 62) is formed in the form of a tapered and the first connection portion 34 to 64 and the second connection portion (35 to 65).

The second to fifth structures of the FRP tubes 30 to 60 shown in FIGS. 3 to 6 may be distinguished according to the connection form of the first and second connecting portions 34 and 35 according to the fastening position of the intermediate tube. .

In the second structure of the FRP tube 30 of FIG. 3, the first connection part 24 of the intermediate tube 32 is formed on the inner side of the upper tube 31, and the second connection part 35 is the lower tube 33. The outer surface of the structure formed.

In the third structure of the FRP tube 40 of FIG. 4, the first connection portion 44 of the intermediate tube 42 is formed on the inner side of the upper tube 41, and the second connection portion 45 is the lower tube 43. The structure formed on the inner side of the.

In the fourth structure of the FRP tube 50 of FIG. 5, the first connection portion 54 of the intermediate tube 52 is formed on the outer surface of the upper tube 51, and the second connection portion 55 is the lower tube 43. The structure formed on the inner side of the.

In the fifth structure of the FRP tube 60 of FIG. 6, the first connecting portion 64 of the intermediate tube 62 is formed on the outer surface of the upper tube 61, and the second connecting portion 65 is the lower tube 63. The structure formed on the outer side of the.

The first connecting portions 34 to 64 and the second connecting portions 35 to 65 are formed in a straight cross section, and inner surfaces of the intermediate tubes 32 to 62 and the upper and lower tubes 31 to 61 and 33 to 63. When the outer diameter of the intermediate tube 32 to 62 and the upper and lower tubes 31 to 61, 33 to 63 when the outer surface of the parts in contact with each other is the same, the inner diameters of the parts in contact with each other are the same. desirable.

To this end, the first connecting portion 34 to 64 and the second connecting portion 35 to 65 have a stepped structure, and the upper and lower tubes 31 to 61 and 33 to 63 are joined to the stepped portion. .

7 is a cross-sectional view of a coupling structure of a composite bushing (first structure) and an injection mold according to the present invention.

As shown in FIG. 7, the FRP tube 71 and the upper and lower brackets 72 and 73 are assembled into the injection mold 76 including the unit injection molds 76a to 76i, and then vacuum-injected. The composite bushing is manufactured by injecting an external housing through the freshly formed part 75 formed in the mold 76.

The unit injection molds are the upper side unit injection molds 76a, 76b and 76c which are located and assembled in the upper tube of the composite bushing, and the inclined unit injection molds 76d and 76e which are located and assembled in the tapered intermediate tube of the composite bushing. And, the lower side unit injection mold (76f, 76g, 76h, 76i) is placed and assembled in the lower tube of the composite bushing, and the thickness and quantity of each unit injection mold can be changed according to the design value, of course. .

Since the inner diameters of the upper side injection molds 76a, 76b, and 76c are the same, and the inner diameters of the lower side injection molds 76f, 76g, 76h, and 76i are also the same, the upper tube and the lower tube of the FRP tube Even if the length becomes longer or shorter without changing the width, the mold assembly can be performed by additionally attaching or detaching the unit injection molds. That is, the length of the composite bushing can be adjusted by the same injection mold.

8 is a view showing an example of manufacturing a composite bushing by the same injection mold through the detachment of the unit injection mold according to the change in the length of the composite bushing (first structure) according to the present invention.

(A) shows a state in which the injection mold 76 and the FRP tube 71 composed of 9 pieces of the unit injection mold shown in FIG. 7 are assembled, and (B) is a shortened length of the upper tube side. The injection mold 76 and the FRP tube 71 in which the unit injection mold 76b is detached are assembled, and (C) shows that the unit injection mold 76j is attached in the state where the length of the lower tube side is increased. Injection mold 76 and the FRP tube 71 is a state assembled.

As shown, even if there is a change in the length of the composite bushing by detaching or attaching the unit injection mold from (A) to (B) and (C), it is possible to manufacture a composite bushing with the same injection mold, which is the It may be possible by bringing the structure into an FRP tube having the same diameter as the present invention.

As described above, the FRP tube according to the present invention and the composite bushing manufactured using the same are manufactured by varying the inner and outer diameters according to the concentrated portion of the electric field, thereby reducing the material savings due to the composite bushing and the amount of insulating filler filled therein. The cost reduction effect is reduced and the inner diameters of the lower side and the upper side are formed in a straight line without any inclination, so that even if the length of the composite bushing is changed by using the unit injection molds, it is possible to manufacture the same mold. This can solve the problem of cost increase.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, As will be understood by those skilled in the art. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

11, 71: FRP tube 12, 72: upper bracket
13, 73: lower bracket 14, 74: housing
21, 31, 41, 51, 61: upper tube 22, 32, 42, 52, 62: intermediate tube
23, 33, 43, 53, 63: lower tube 34, 44, 54, 64: first connection
35, 45, 55, 65: second connecting portion 75: lampshade forming portion
76: injection mold
76a, 76b, 76c, 76d, 76e, 76f, 76g, 76h, 76i, 76j: unit injection mold

Claims (8)

A cylindrical upper tube having a predetermined inner and outer diameter,
A lower tube having an inner and outer diameter larger than the inner and outer diameters of the upper tube,
And a tapered conical intermediate tube connecting the upper tube and the lower tube to each other. The method of claim 1,
The upper tube, the lower tube and the intermediate tube is manufactured integrally, FRP tube for composite bushings having different inner and outer diameters at both ends. The method of claim 1,
The upper tube, the lower tube and the intermediate tube is made of separate molds, each of which is wound and assembled by an adhesive, each of the composite bushing FRP tube having a different inner and outer diameters. The method of claim 3,
Both ends of the intermediate tube are formed with a stepped first connection part and a second connection part,
A composite bushing FRP tube having different inner and outer diameters at both ends, which are assembled with the upper tube and the lower tube by the first and second connectors. 5. The method of claim 4,
A composite bushing FRP tube having different inner and outer diameters at both ends thereof, by which the intermediate tube may be assembled to the inner side or the outer side of the upper tube and the lower tube by the first connection part and the second connection part. 5. The method of claim 4,
When the intermediate tube is assembled to the inner surface of the upper tube and the lower tube by the step of the first connecting portion and the second connecting portion, the outer diameter is the same, and the intermediate tube is the outer surface of the upper tube and the lower tube. A composite bushing FRP tube having different inner and outer diameters at both ends when the inner diameter is the same. A FRP tube comprising a cylindrical upper tube having a predetermined inner and outer diameter, a lower tube having an inner and outer diameter larger than the inner and outer diameters of the upper tube, and a tapered conical intermediate tube connecting the upper tube and the lower tube to each other; ,
Upper and lower brackets are assembled to the upper and lower ends of the FRP tube,
Comprising a composite bushing having different inner and outer diameters at both ends, including a housing which is injection-molded to form a plurality of shades in the state where the FRP tubing and the upper and lower brackets are assembled. The method of claim 7, wherein
The upper and lower tubes of the FRP tube, the lower tube and the intermediate tube is made of a single piece, or a separate bushing of the inner and outer diameters of the both ends, which is manufactured by winding each mold in a separate form and assembled together by an adhesive.

Images